They are not made of the stretchy materials that some shorts are made of, but these shorts do have "give" to them. I tend to be in shorts about 9 months out of the year and have been wearing the LL Bean shorts for the past year. I tend to put my clothing through the paces... These shorts have been through butt-slides down rocks, in and out of water (salt water, as well as fresh water), in sunny/harsh environments (I work in another country 3 months out of the year...where I could not replace them if I needed to), and have been put through a lot of bending/squatting/lifting situations. While these might not be the best shorts for everyone, I am certainly convinced of their durability. I started wearing these shorts when I finally wore out a couple of pairs of Patagonia shorts that I had forever (and used religiously as a river guide).
Patagonia shorts can be pricey, so I tested the LL Bean shorts as a "backup plan." They didn't cost so much that I would be upset if they didn't work out for me. Turns out that I found a nice alternative to the Patagonia shorts. I wouldn't hesitate to wear these shorts on the trail. Have never had any issues with restriction. But, like all gear, they are not for everyone. Since price tends to be an issue when trying something out for the first time, I seconded these shorts... I will be putting these shorts through even more gear testing on trails in Maine and New Hampshire this summer.